Rin-chan, who lives in Yamanashi Prefecture, has been secretly in love with her paternal uncle since she was young. Her uncle, who lives in the city due to work, is always busy and hasn't returned home for a long time. However, Rin-chan bravely thinks of him even when they can't meet and often masturbates to comfort herself. One day, unable to suppress her feelings any longer, she told her parents that she wanted to go see her favorite idol's live performance but thought the money would be wasted, so she asked if she could stay at her uncle's house. Thus, Rin-chan traveled alone on local trains to her uncle's home…
